Marriott's website list the following requirements for LT Status:

Lifetime Silver: 250 nights + 1.2 million points
Lifetime Gold: 500 nights + 1.6 million points
Lifetime Platinum: 750 nights + 2 million points

A few things are unclear to me.

1. Regarding points, does that mean you must maintain a balance of 1.2, 1.6, or 2 million points in your account, or you must simply have earned that many points over the duration of your time as a Marriott Rewards member?

2. Do CC signup bonuses (Ex: Premier Visa) count toward the points total? How about points transferred to your account from other reward credit cards, points earned through Megabonuses and/or Shopping Portals?

3. Is there a way to "check your progress" toward LT Elite status in your account?

Thank you for any clarifications you experts can provide!